Moisture-proof package and process of making the same.



S. B. FIELD.

MOISTURE PROOF PACKAGE AND PROCESS OF MAKING THE SAME.

APPLICATION FILED DEC. 14. I917.

Patented Apr. 30, 1918.

fizz/en Z07? JW 06 A 69446744 PM;

" citiien ofthe United States, residin UNITED STATES PATENT OFFICE.

SAMUEL 1B. FIELD, OF HOLBROOK, MASSACH USET'IS, ASSICNOB TO PNEUMATICSCALE CORPORATION, LIMITED, OF QUINCY, MASSACHUSETTS, A CORPORATION OFMAINE.

MOISTURE-PROOF PACKAGE AND PROCESS OF MAKING THE SAME.

Specification of Letters Patent.

Patented Apr. 30, 1918.

Application flied December 14;, 1917. Serial No. 207,023.

To all whom it may concern:

Beit known that I, SAMUEL B. From), a at Holbrook, Mass, county ofNorfolk, tate of. Massachusetts, have invented a certain new and usefulImprovement in Moisture- Proof Packages and Processes of Making theSame, of which the following is a specification, reference being hadtherein to the accompanying drawings.

The invention relates to an improvement in; moisture proofsealed'packages and in the method of producing the same. The obj ect ofthe invention is to provide a moisture proof wrapped and sealed package,the wrapping and sealing of which is relatively inexpensive, which ismoisture proof under all ordinary exposures to the atmosphere, which isneat in appearance, which is ready for display in its wrapped and sealedcondition, and which when sold over the coun ter does not require anadditional wrapping but is ready for elivery to the cusmanner both by.the use of relatively cheapn'i-aterial and by economy in the process ofwrapping and sealing.

The invention may be applied to a closed packagewhich has first been putup in any ordinary way, as 'for instance putting the goods into anordinary carton having end forming flaps which are'closed and pasted ifdesired, or the goods may be put up in a paste board box having a cover,or in a paper bag having the mouth closed by folding the projecting topend of the bag and preferably securing the top in a closed position bypaste or tape or string or any other suitable method. The seahng wrappercon-- by the application of heat so that said lining sheet will adhereboth to the inner shell itself and to the outer wrapping sheetthroughout all portions of the contacting surfaces, and which willbecome dry and preferably pliable as soon as it is allowed to cool, saidsubstance with which the paper is treated having also the characteristicof making the lining sheet moisture proof.

The invention will be fully understood by reference to the followingdescription when taken in connection with the accompanying drawings andthe novel features thereof will be pointed out and clearly defined inthe claims at the close of this specification.

In the drawings, Figure 1 is a perspective view of a packa e having thelined wrapper folded about it in tubular form, two of the cornersshowing the lining sheet turned back from the outer sheet merely to showthat there are two .sheets.

Fig. 2 shows the wrapper completely folded on the sides and on thebottom and partially folded at the top.

Fig. 3 is a perspective View showing the completely wrapped and sealedpackage.

Fig. 4; is a sectional view on line 44 of Fig. 3.

Fig. 5 is a sectional view of a portion of the inner moisture proof orlining sheet of the wrapper before it is combined with the outer sheet.

Referrin now to the drawings, 1 indicates the original unwrapped packagewhich is shown in dotted lines in Fig. 1 of conventional form. Thispackage may be as previously stated a filled carton or a filled paperbag or box of any kind either sealed or unsealed. This may be made ofvery cheap sheet material, all that is necessary being that it should besufliciently strong to hold the material until it can be wrapped in themanner provided by the invention.

A sheet of paper 2 which will be ultimately the outside layer of thecompletely wrapped and sealed package may have on one face thereof anynecessary or desired printing which it isdesired to have upon theoutside of the finished package. This sheet of paper is spread out flatand there is then laid flat upon this sheet another sheet 3 preferablyof the same size and shape as the sheet 2. This sheet 3 is properlyprepared before being laid upon the sheet 2. It may be treated after itis cut to the proper shape, or it may be cut from a large sheet whichhas been treated in a manner which will be hereinafter described andwhich may be cut up to form blanks of the suitable size. This sheet .3whether treated individually as a separate blank or while forming a partof a larger sheet just above described is treated as follows. Both facesof the sheet are given a coat of substance, preferably in liquid orpasty form, which has the characteristic of adhering to or permeatingthe sheet 3 when the coating is applied hot and which dries hard andpliable and remains hard but pliable under any natural conditions of theatmosphere either during the warmth of the summer or cold of the winter,but which when again heated to a high temperature, that is a temperatureabove any natural condition of the atmosphere at any season of 'theyear, will soften so that if pressure is applied to the overlying sheetwhile the coating is in the softened condition the two sheets will becausedto adhere together, and once having adhered they will not separatewithout being heated again to the abnormal temperature.

One formula for a suitable preparation to apply to the said inner sheetis as follows:

. one and one-half pounds of Burgundy pitch,

3 ounces of paraffin and eight one-hundredths of an ounce of rosin oil.The Burgundy pitch ismelted first and then the sheet when said mixtureis at a temperature considerably above any normal state of theatmosphere, preferably at about 200 Fahn, and then the sheet is allowedto dry. Any

resinous pitch may be used, and-dry rosin may be used as a substitutefor pitch, but

it is preferable to use the Burgundy pitch because the melting point isconsiderably lower than the rosin or other kinds of pitch so that whenthe sheet is applied to the package in combination with the outer sheet1 a lower degree ofheat is possible in sealing it than if the Burgundypitch were omitted.

In Fig. 5 the two surface layers of this preparation upon the sheet 3are indicated by 4, 4 respectively.

In applying the wrapper, the sheet 3 hav-' ing the upper and underlayers 4, 4: is spread flat upon a sheet of the outer layer 2 upon aflat surface, and the package 1 is then .wrapped up simultaneously-inboth sheets length of time to thoroughly heat the coating upon the twosurfaces of the sheet-3 which in the wrapped package now becomes anintermediate sheet between the package 1 and the outer sheet 2. Thisheat softens the composition which has been applied to the sheet 3 andunder pressure it will adhere to both the inner package and to' theinner sheet 2. When the hot pressure is removed the adhesive coatingwill dry and make a firm, permanent adhesion between the sheet 3 andboth the inner package and the outer sheet.

If desired, instead of folding the wrapper complete before applying anyheat, the heat and pressure may be applied to the sides after it iswrapped in tubular form as shown in Fig. 1, then the bottom may befolded a shown in Fig. 2 and that may be sealed by applying the heat andpressure, and then the top may be folded and sealed. This however is amatter of option depending upon the convenience of the operator and uponthe sort of heating pressure device which is employed.

While I have given one formula for a preparation which may be used intreating the inner or lining sheet of the wrapper to give it the properadhesive characteristic and while I have stated also that one of thethree ingredients, namely, Burgundy pitch, may be omitted, itis notintended herein to limit the inventionto the use of a preparationaccording to the formula given either with or without the Burgundypitch. It is intended that the claims shall be broad enough to cover theuse of any suitable preparation which is capable of producing thespecified result, namely, any waterproof preparation which is adhesiveat a temperatureabove all normal atmospheric temperatures and which isdry at all normal atmospheric temperatures. For instance the naturalatmospheric temperature seldom rises above 100 Fahr. and fairly goodsuccess would be had with the use of a coating Which might soften at 100but in a hot climate and especially upon exposure to the sun theatmospheric temperature sometimes rises above 100. It ismuch safer tohave the coating made of a preparation which will remain hard and dryuntil the temperature rises to at least 150 and still safer would be aminimum temperature forsoftening at expense of unnecessarily excessiveheat which would also tend to burn the paper.

It is important that the coating on both sides of the inner or liningsheet should be left in a pliable condition as well as nonstickywhen itdries so that in the handling it pliable. If the rosin 'or'someequivalent thereof is omitted and paraflin alone is mixed with the pitchso much paraffin has to .be used that the compound becomes too much of aparaflin compound and it is not sticky enough when hot to give theproper adhesion between the inner shell and the outside wrapper-sheet.If the pa'raflin or some equivalent thereof is not used and if rosin oilalone is used with the pitch to render it pliable so much rosin 011has'to be used to make-the coating pliable that it makes the mixturenon-drying when cool and the coated sheet will always be sticky innormal temperature. The use of both paraffin and rosin oil however keepsthe coating in proper condition so that although it is sticky when hot,it is'both pliable and nonsticky when cool or at their normaltemperature.

In the process of wrapping and sealing the package according to thepresent invention there'is absolutely no stickiness whatever in handlingthe package, the lining itself being dry and unsticky during all partsof the process when it could come in contact with the hands or with themachinery. During the time that it isin a sticky condition due to heat,it is out of hand touch, being .entirely protected .by the outer sheetand after the package is completely wrapped and sealed there is nostickiness whatever on I the outside either under normal tempera turesor when the package is heated suflicient to soften the coating on thelining. The outside appearance of the package is just the same as anun-waterproofed package and although when exposed to moisture, themoisture might permeate the outer sheet of the wrapper until it reachedthe outer coat ing of the lining, it cannot penetrate the lining, andtherefore,'th e contents of the package and the inner shell itself arecompletely protected.

While I have stated that preferably the lining sheet is coated on bothsides with the adhesive preparation so that it may be made to adhereboth to the package and to the outer wrappin sheet, fairly good resultsmay be obtain by coating one side only of the lining sheet so that bythe application of heat under pressure the lining sheet may be made toadhere either to the outer wrapping sheet or to the package according towhichever side of the lining is coated.

. It is also possible to obtain fairly good results if instead ofemploying two sheets the intermediate or lining sheet is omitted and athe coating is applied directly to the inner face of the outer orwrapper sheet so that it will be made to adhere directly to the innershell upon the application of pressure and heat. Neither of the lasttwo, described forms of construction is so desirable or effective as theemployment of the lining sheet coated on both sides, but I considereither of such additional constructions to come within the scope of theinvention.

The moisture proof lining serves not only to protect the contents of thepackage against absorption of moisture from the outside, but it alsoserves to prevent the evaporation of moisture which is contained withinthe pack Single lined sheet around said closed inner shell, the liningsheet of said wrapper having upon both faces a coating of moisturerepellent adhesive material, said coating having the characteristic ofbeing soft and sticky under a high degree of heat above naturalatmospheric temperatures and being pliable vand non-sticky under naturalatmospheric temperatures, said lining sheet being adhesively attachedthroughout its surfaces to the contacting portions of both the innershell and the outer sheet of the wrapper by means of said adhesivecoating.

2. A sealed wrapped package comprising an inner closed shell whichcontains the goods, a wrapper consisting of an inner and an outer sheetwrapped and folded as a single lined sheet around said closed innershell, the lining sheet of said wrapper having upon both its faces acoating of moisture repellent adhesive material, said coating having thecharacteristic of being dry and hard under all natural atmospherictemperatures and being soft and adhesive under a high degree of heatabove natural atmospheric temperatures, said lining .sheet beingadhesively attached throughout its surfaces to the contacting portionsof the inner shell and of said outer sheet by means of said adhesivecoating.

3. A sealed wrapped package comprisin an inner shell which contains thegoods, an a wrapper folded about and sealed to said inner shell, saidwrapper consisting of an outer sheet and a lining sheet, said liningbeing adhesively attached throughout one face to said outer sheet andthroughout the contacting portion of its other face to said inner shellby means of a coating of moisture repellent adhesive material on both ofsaid faces, said coating having the characnot exceed at least 100 Fahr.

4. A sealed wrapped package comprising an inner shell which contains thegoods, and a Wrapper folded about and sealed to said inner shell, saidwrapper consisting of an outer sheet and a lining sheet, said liningbeing adhesively attached throughout one face to said outer sheet andthroughout the contacting portion of its other face to said inner shellby means of a coating of moisture repellent adhesive material on both ofsaid faces, said coating consisting of a composition containing pitch,paraffin and rosin 5. A sealed wrapped package comprising an inner shellwhich contains the goods, and a wrapper folded about and sealed to saidinner shell, said wrapper consisting of an outer sheet and a liningsheet, said lining being adhesively attached throughout one face to saidouter sheet and throughout the contacting portion of its other face tosaid inner shell by means of a coating of moisture repellant adhesivematerial' on both of said faces, said coating consisting of acomposition containing Burgundy pitch, paraffin and rosin oil.

6. A sealed wrapped package comprisin an inner shell which contains thegoods and a wrapper folded about and sealed to said inner shell, saidwrapper consisting of an outer sheet and a lining sheet, said liningbeing adhesively attached throughout one face to said outer sheet andthroughout the contacting portion of its other face to said inner shellby means of a coating of moisture repellent adhesive material on both ofsaid faces, said coating consisting of a composition containing Burgundypitch and another moisture repellent substance.

7 A sealed wrapped package comprising an inner shell which contains thegoods and a wrapper folded about and sealed to said inner shell, saidwrapper consisting of an outer sheet and a lining sheet, said liningbeing adhesively attached throughout one face to said outer sheet andthroughout the contacting portion of its other face to said inner shellby means of a coating of moisture repellent adhesive material on both ofsaid faces in substantially the following proportions, one and one-halfpounds of Burgundy pitch, three ounces of paraffin, and eight one-hundredths of an ounce of rosin oil.

' 8-. The method of forming a moisture proof wrapped and sealed packageconsisting of folding about an inner shell which contains the goods, aloose lined wrapper consisting of two' sheets, one sheet of which issuperimposed loose upon the other sheet before being wrapped, the twosheets then being wrapped and folded as one about the dry and hard undernatural atmospheric temperatures and which is soft and adhesive under ahigh degree of heat above the natural atmospheric temperature,subjecting the outer surface of the wrapped package to heat underpressure of sufficiently high temperature to soften said coating andcause the lining to adhere to both the inner shell and the outer sheet,and then allowing the package to cool.

9. The method of forming a moisture proof wrapped and sealed packageconsisting of folding about an inner shell which contains the goods, awrapper having a sheet lining which has on both faces thereofa coatingof moisture repellent adhesive material whichhas the characteristic ofbeing dry and hard under at least all temperatures which arebelow 100Fahr. and which sof- 'tens under a high degree'of heat at a tem lwrappedand sealed package consisting of folding about an inner shell whichcontains the goods, a wrapper having a sheet lining which has on bothfaces thereof a coating of moisture repellent adhesive material whichhas the characteristic of being dry and hard under at least alltemperatures which are below 100 Fahr. and which softens under a degreeof heat at. a temperature which is at least in excess of 100 Fahr. saidcoating consisting of a composition containing p'ar aflin and rosin'oil,and a pitchy substance, and subjecting the outer surface of the wrappedpackage to heat sufficient to soften said adhesive and to pressure whileso heated and then allowing the package to cool to a temperature belowthe hardening point.

11. The method of forming a moisture proof wrapped and sealed packageconsist-' ing of folding about an inner shell which contains the goods,a wrapper having a sheet lining which when the wrapper 1s being foldedis unattached to the outer sheet and which has on both faces thereof acoating of moisture repellent adhesive material which has thecharacteristic of being dry and hard under at least all temperatureswhich are below 100 Fahr. and which is soft under a high degree of heatat a tempera-- ture which is at least in excess of 100 Fahr.,saidcoating containing Burgundy pitch as one of its ingredients,subjecting the outer surface of the wrapped package to heat suflicientto soften said adhesive and to pressure while so heated, and thenallowing the package to cool to a temperature below the hardtemperatureswhich "are below 100 Fahn' and which is soft under a high degree of heatat a temperature which is at least in excess of 100 Fahn, said coatingcomposi tion containing Burgundy pitch, paraflin and rosin oil,subjecting the outer surface of y the wrapped package to heat suflicientto soften said adhesive and to pressure while i so heated and thenallowing the package to cool to a temperature below the hardening point.

13. The method of forming amoisture proof wrapped and sealed packageconsisting of folding about an inner shell which contains the goods, aWrapper having a loose sheet lining which has on both faces thereof'acoating of moisture repellent adhesive material which has thecharacteristic of being dry and hard under at least all temperatureswhich are below 100 Fahr. and which is soft under a high degree of heatat a temperature which is at least in excess of 100 Fahn, said coatingcomposition containing Burgundy pitch, parafiin and rosin oil insubstantially the following proportions, one and one-half pounds ofBurgundy pitch, three ounces of paraflin and eightone-hundredths of anounce of rosin oil, subjecting the outer surface of the wrapped packageto heat suflicient to soften said adhesive and to pressure while soheated and then allowing the package to cool to a temperature below thehardening point.

14. A sealed wrapped package comprising a closed inner shell whichcontains the goods and a wrapper consisting ofan inner and an outersheet wrapped and folded as a lined sheet around said closed innershell, one of said sheets having upon at least one face thereof acoating ofmoisture repellent material, said coating having thecharacteristic of bein soft and sticky under a high degree of eat abovenatural atmospheric temperatures and being pliable and non- "stickyunder natural atmospheric tempera tures, the sheet which is providedwith said coating being adhesively attached to the entire contactingsurface of the other member I or members of the package.

15. A sealed wrapped package comprising an inner closed shell whichcontains the goods, a paper wrapper folded around said inner shell and afilm of moisture repellent adhesive material between the wrapper and theinner shell, said film having the characteristic of being soft andsticky under a high degree of heat above natural atmospherictemperatures and being pliable and non-sticky under natural atmospherictemperatures, the proximate surfaces of said package which contact withsaid film being adhesively connected together by said film.

16. A sealed wrapped package comprising an inner closed shell whichcontains the goods, a paper wrapper folded around said inner shell, anda film of moisture repellent adhesive material between the wrapper andthe inner shell, said film consisting of a composition containing pitch,paraflin and rosin oil, the proximate surfaces of said package whichcontact with said film being adhesively connected together by said film.

In testimony whereof I aifix my signature.

SAMUEL B. FIELD.

